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Design of Small-Scaled de Laval Nozzle for IGLIS Experiment

De Laval nozzles are used in supersonic aerodynamical tubes and engines. They are also employed for the production of cold gas jets to be used in chemical reactions studies. Recently, cold gas jets have been proposed of In-Gas Laser ionization Spectroscopy (IGLIS)
The nozzle has a converging and a diverging part with a throat between them. High gas pressure and temperature, and low velocity are present before the converging part, while low pressure and temperature and high velocity are reached after the diverging one. For the IGLIS experiments a uniform jet of noble gas (argon or helium) with Mach number up to 12 is required.
The nozzle design includes viscous effects and to account for them, COMSOL Multiphysics® has been used. Disagreements of the Mach number within 6% with respect to the nominal values are reached.